citadel/event_client.c

   1 /*
   2  *
   3  * Copyright (c) 1998-2009 by the citadel.org team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 #include "sysdep.h"
  21 #include <stdlib.h>
  22 #include <unistd.h>
  23 #include <stdio.h>
  24 #include <termios.h>
  25 #include <fcntl.h>
  26 #include <signal.h>
  27 #include <pwd.h>
  28 #include <errno.h>
  29 #include <sys/types.h>
  30 #include <syslog.h>
  31
  32 #if TIME_WITH_SYS_TIME
  33 # include <sys/time.h>
  34 # include <time.h>
  35 #else
  36 # if HAVE_SYS_TIME_H
  37 #  include <sys/time.h>
  38 # else
  39 #  include <time.h>
  40 # endif
  41 #endif
  42 #include <sys/wait.h>
  43 #include <ctype.h>
  44 #include <string.h>
  45 #include <limits.h>
  46 #include <sys/socket.h>
  47 #include <netinet/in.h>
  48 #include <arpa/inet.h>
  49 #include <assert.h>
  50
  51 #include <libcitadel.h>
  52 #include "citadel.h"
  53 #include "server.h"
  54 #include "citserver.h"
  55 #include "support.h"
  56 #include "config.h"
  57 #include "control.h"
  58 #include "user_ops.h"
  59 #include "database.h"
  60 #include "msgbase.h"
  61 #include "internet_addressing.h"
  62 #include "genstamp.h"
  63 #include "domain.h"
  64 #include "clientsocket.h"
  65 #include "locate_host.h"
  66 #include "citadel_dirs.h"
  67
  68 #include "event_client.h"
  69
  70 extern int event_add_pipe[2];
  71 extern citthread_mutex_t EventQueueMutex;
  72 extern HashList *InboundEventQueue;
  73 extern struct ev_loop *event_base;
  74
  75
  76 int QueueEventContext(AsyncIO *IO, IO_CallBack CB)
  77 {
  78         IOAddHandler *h;
  79         int i;
  80
  81         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
  82         h->IO = IO;
  83         h->EvAttch = CB;
  84
  85         citthread_mutex_lock(&EventQueueMutex);
  86         if (event_add_pipe[1] == -1) {
  87                 citthread_mutex_unlock(&EventQueueMutex);
  88                 free (h);
  89                 return -1;
  90         }
  91         CtdlLogPrintf(CTDL_DEBUG, "EVENT Q\n");
  92         i = GetCount(InboundEventQueue);
  93         Put(InboundEventQueue, IKEY(i), h, NULL);
  94         citthread_mutex_unlock(&EventQueueMutex);
  95
  96         write(event_add_pipe[1], "+_", 1);
  97         CtdlLogPrintf(CTDL_DEBUG, "EVENT Q Done.\n");
  98         return 0;
  99 }
 100
 101
 102 int ShutDownEventQueue(void)
 103 {
 104         citthread_mutex_lock(&EventQueueMutex);
 105         if (event_add_pipe[1] == -1) {
 106                 citthread_mutex_unlock(&EventQueueMutex);
 107
 108                 return -1;
 109         }
 110         write(event_add_pipe[1], "x_", 1);
 111         close(event_add_pipe[1]);
 112         event_add_pipe[1] = -1;
 113         citthread_mutex_unlock(&EventQueueMutex);
 114         return 0;
 115 }
 116
 117 void FreeAsyncIOContents(AsyncIO *IO)
 118 {
 119         FreeStrBuf(&IO->IOBuf);
 120         FreeStrBuf(&IO->SendBuf.Buf);
 121         FreeStrBuf(&IO->RecvBuf.Buf);
 122 }
 123
 124
 125 void ShutDownCLient(AsyncIO *IO)
 126 {
 127         CtdlLogPrintf(CTDL_DEBUG, "EVENT x %d\n", IO->sock);
 128
 129         if (IO->sock != 0)
 130         {
 131                 ev_io_stop(event_base, &IO->send_event);
 132                 ev_io_stop(event_base, &IO->recv_event);
 133                 ev_timer_stop (event_base, &IO->rw_timeout);
 134                 close(IO->sock);
 135                 IO->sock = 0;
 136                 IO->SendBuf.fd = 0;
 137                 IO->RecvBuf.fd = 0;
 138         }
 139         if (IO->DNSChannel != NULL) {
 140                 ares_destroy(IO->DNSChannel);
 141                 ev_io_stop(event_base, &IO->dns_recv_event);
 142                 ev_io_stop(event_base, &IO->dns_send_event);
 143                 IO->DNSChannel = NULL;
 144         }
 145         assert(IO->Terminate);
 146         IO->Terminate(IO);
 147
 148 }
 149
 150
 151 eReadState HandleInbound(AsyncIO *IO)
 152 {
 153         eReadState Finished = eBufferNotEmpty;
 154
 155         while ((Finished == eBufferNotEmpty) && (IO->NextState == eReadMessage)){
 156                 if (IO->RecvBuf.nBlobBytesWanted != 0) {
 157
 158                 }
 159                 else { /* Reading lines... */
 160 //// lex line reply in callback, or do it ourselves. as nnn-blabla means continue reading in SMTP
 161                         if (IO->LineReader)
 162                                 Finished = IO->LineReader(IO);
 163                         else
 164                                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 165
 166                         switch (Finished) {
 167                         case eMustReadMore: /// read new from socket...
 168                                 return Finished;
 169                                 break;
 170                         case eBufferNotEmpty: /* shouldn't happen... */
 171                         case eReadSuccess: /// done for now...
 172                                 break;
 173                         case eReadFail: /// WHUT?
 174                                 ///todo: shut down!
 175                                 break;
 176                         }
 177
 178                 }
 179
 180                 if (Finished != eMustReadMore) {
 181                         assert(IO->ReadDone);
 182                         ev_io_stop(event_base, &IO->recv_event);
 183                         IO->NextState = IO->ReadDone(IO);
 184                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 185                 }
 186         }
 187
 188
 189         if ((IO->NextState == eSendReply) ||
 190             (IO->NextState == eSendMore))
 191         {
 192                 assert(IO->SendDone);
 193                 IO->NextState = IO->SendDone(IO);
 194                 ev_io_start(event_base, &IO->send_event);
 195         }
 196         else if ((IO->NextState == eTerminateConnection) ||
 197                  (IO->NextState == eAbort) )
 198                 ShutDownCLient(IO);
 199         return Finished;
 200 }
 201
 202
 203 static void
 204 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 205 {
 206         int rc;
 207         AsyncIO *IO = watcher->data;
 208
 209         rc = StrBuf_write_one_chunk_callback(watcher->fd, 0/*TODO*/, &IO->SendBuf);
 210
 211         if (rc == 0)
 212         {
 213 #ifdef BIGBAD_IODBG
 214                 {
 215                         int rv = 0;
 216                         char fn [SIZ];
 217                         FILE *fd;
 218                         const char *pch = ChrPtr(IO->SendBuf.Buf);
 219                         const char *pchh = IO->SendBuf.ReadWritePointer;
 220                         long nbytes;
 221
 222                         if (pchh == NULL)
 223                                 pchh = pch;
 224
 225                         nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 226                         snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d", "smtpev", IO->sock);
 227
 228                         fd = fopen(fn, "a+");
 229                         fprintf(fd, "Read: BufSize: %ld BufContent: [",
 230                                 nbytes);
 231                         rv = fwrite(pchh, nbytes, 1, fd);
 232                         fprintf(fd, "]\n");
 233
 234
 235                         fclose(fd);
 236                 }
 237 #endif
 238                 ev_io_stop(event_base, &IO->send_event);
 239                 switch (IO->NextState) {
 240                 case eSendReply:
 241                         break;
 242                 case eSendMore:
 243                         assert(IO->SendDone);
 244                         IO->NextState = IO->SendDone(IO);
 245
 246                         if ((IO->NextState == eTerminateConnection) ||
 247                             (IO->NextState == eAbort) )
 248                                 ShutDownCLient(IO);
 249                         else {
 250                                 ev_io_start(event_base, &IO->send_event);
 251                         }
 252                         break;
 253                 case eReadMessage:
 254                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty) {
 255                                 HandleInbound(IO);
 256                         }
 257                         else {
 258                                 ev_io_start(event_base, &IO->recv_event);
 259                         }
 260
 261                         break;
 262                 case eTerminateConnection:
 263                 case eAbort:
 264                         break;
 265                 }
 266         }
 267         else if (rc < 0) {
 268                 assert(IO->Timeout);
 269                 IO->Timeout(IO);
 270         }
 271         /* else : must write more. */
 272 }
 273 static void
 274 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents)
 275 {
 276
 277         switch(IO->NextState) {
 278         case eReadMessage:
 279                 ev_io_start(event_base, &IO->recv_event);
 280                 break;
 281         case eSendReply:
 282         case eSendMore:
 283                 IO_send_callback(loop, &IO->send_event, revents);
 284                 break;
 285         case eTerminateConnection:
 286         case eAbort:
 287                 /// TODO: WHUT?
 288                 break;
 289         }
 290 }
 291
 292 static void
 293 IO_Timout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 294 {
 295         AsyncIO *IO = watcher->data;
 296
 297         ev_timer_stop (event_base, &IO->rw_timeout);
 298         assert(IO->Timeout);
 299         IO->Timeout(IO);
 300 }
 301 static void
 302 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 303 {
 304         AsyncIO *IO = watcher->data;
 305
 306         ev_timer_stop (event_base, &IO->conn_fail);
 307         ev_io_stop(loop, &IO->conn_event);
 308         assert(IO->ConnFail);
 309         IO->ConnFail(IO);
 310 }
 311 static void
 312 IO_connestd_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 313 {
 314         AsyncIO *IO = watcher->data;
 315
 316         ev_io_stop(loop, &IO->conn_event);
 317         ev_timer_stop (event_base, &IO->conn_fail);
 318         set_start_callback(loop, IO, revents);
 319 }
 320 static void
 321 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 322 {
 323         ssize_t nbytes;
 324         AsyncIO *IO = watcher->data;
 325
 326         nbytes = StrBuf_read_one_chunk_callback(watcher->fd, 0 /*TODO */, &IO->RecvBuf);
 327         if (nbytes > 0) {
 328                 HandleInbound(IO);
 329         } else if (nbytes == 0) {
 330                 assert(IO->Timeout);
 331                 IO->Timeout(IO); /* this is a timeout... */
 332                 return;
 333         } else if (nbytes == -1) {
 334 /// TODO: FD is gone. kick it.        sock_buff_invoke_free(sb, errno);
 335                 return;
 336         }
 337 }
 338
 339 void
 340 IO_postdns_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 341 {
 342         AsyncIO *IO = watcher->data;
 343         IO->PostDNS(IO);
 344 }
 345
 346 eNextState event_connect_socket(AsyncIO *IO, double conn_timeout, double first_rw_timeout)
 347 {
 348         int fdflags;
 349         int rc = -1;
 350
 351         IO->SendBuf.fd = IO->RecvBuf.fd =
 352                 IO->sock = socket(
 353                         (IO->IP6)?PF_INET6:PF_INET,
 354                         SOCK_STREAM,
 355                         IPPROTO_TCP);
 356
 357         if (IO->sock < 0) {
 358                 CtdlLogPrintf(CTDL_ERR, "EVENT: socket() failed: %s\n", strerror(errno));
 359                 StrBufPrintf(IO->ErrMsg, "Failed to create socket: %s", strerror(errno));
 360 //              freeaddrinfo(res);
 361                 return eAbort;
 362         }
 363         fdflags = fcntl(IO->sock, F_GETFL);
 364         if (fdflags < 0) {
 365                 CtdlLogPrintf(CTDL_DEBUG,
 366                               "EVENT: unable to get socket flags! %s \n",
 367                               strerror(errno));
 368                 StrBufPrintf(IO->ErrMsg, "Failed to get socket flags: %s", strerror(errno));
 369                 return eAbort;
 370         }
 371         fdflags = fdflags | O_NONBLOCK;
 372         if (fcntl(IO->sock, F_SETFL, fdflags) < 0) {
 373                 CtdlLogPrintf(CTDL_DEBUG,
 374                               "EVENT: unable to set socket nonblocking flags! %s \n",
 375                               strerror(errno));
 376                 StrBufPrintf(IO->ErrMsg, "Failed to set socket flags: %s", strerror(errno));
 377                 close(IO->sock);
 378                 return eAbort;
 379         }
 380 /* TODO: maye we could use offsetof() to calc the position of data...
 381  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
 382  */
 383         ev_io_init(&IO->recv_event, IO_recv_callback, IO->sock, EV_READ);
 384         IO->recv_event.data = IO;
 385         ev_io_init(&IO->send_event, IO_send_callback, IO->sock, EV_WRITE);
 386         IO->send_event.data = IO;
 387
 388         ev_timer_init(&IO->conn_fail, IO_connfail_callback, conn_timeout, 0);
 389         IO->conn_fail.data = IO;
 390         ev_timer_init(&IO->rw_timeout, IO_Timout_callback, first_rw_timeout, 0);
 391         IO->rw_timeout.data = IO;
 392
 393         if (IO->IP6)
 394                 rc = connect(IO->sock, &IO->Addr, sizeof(struct sockaddr_in6));
 395         else
 396                 rc = connect(IO->sock, (struct sockaddr_in *)&IO->Addr, sizeof(struct sockaddr_in));
 397
 398         if (rc >= 0){
 399 ////            freeaddrinfo(res);
 400                 set_start_callback(event_base, IO, 0);
 401                 ev_timer_start(event_base, &IO->rw_timeout);
 402                 return IO->NextState;
 403         }
 404         else if (errno == EINPROGRESS) {
 405
 406                 ev_io_init(&IO->conn_event, IO_connestd_callback, IO->sock, EV_READ|EV_WRITE);
 407                 IO->conn_event.data = IO;
 408
 409                 ev_io_start(event_base, &IO->conn_event);
 410                 ev_timer_start(event_base, &IO->conn_fail);
 411                 return IO->NextState;
 412         }
 413         else {
 414                 CtdlLogPrintf(CTDL_ERR, "connect() failed: %s\n", strerror(errno));
 415                 StrBufPrintf(IO->ErrMsg, "Failed to connect: %s", strerror(errno));
 416                 assert(IO->ConnFail);
 417                 IO->ConnFail(IO);
 418                 return eAbort;
 419         }
 420         return IO->NextState;
 421 }
 422
 423 void SetNextTimeout(AsyncIO *IO, double timeout)
 424 {
 425         IO->rw_timeout.repeat = timeout;
 426         ev_timer_again (event_base,  &IO->rw_timeout);
 427 }
 428
 429 eNextState InitEventIO(AsyncIO *IO,
 430                        void *pData,
 431                        double conn_timeout,
 432                        double first_rw_timeout,
 433                        int ReadFirst)
 434 {
 435         IO->Data = pData;
 436
 437         if (ReadFirst) {
 438                 IO->NextState = eReadMessage;
 439         }
 440         else {
 441                 IO->NextState = eSendReply;
 442         }
 443         return event_connect_socket(IO, conn_timeout, first_rw_timeout);
 444 }